JPS59133243A - Stabilized polyvinyl chloride molding composition - Google Patents

Abstract

1. Stabilized polyvinylchloride molding compositions containing - to 100 parts by weight polymer a) from 0.02 to 5 parts by weight of at least one compound corresponding to the following formulae (I) and (II) : see diagramm : EP0111896,P11,F1 in which X**1 and X**2 independently of one another represent hydrogen or the SH-group, at least one of the substituents X**1 and X**2 being an SH-group, and R**1, R**2 and R**3 represent straight-chain or branched C5 -C22 alkyl groups, as co-stabilizers, b) from 0.05 to 5 parts by weight primary stabilizers selected from the group comprising metal soaps, aromatic metal carboxylates and metal phenolates, c) from 0.2 to 5 parts by weight of a synthetic, crystalline, finely divided sodium alumosilicate which contains from 13 to 25 % by weight bound water and which, in its anhydrous form, has the composition 0.7 to 1.1 Na2 O . Al2 O3 . 1.3 to 2.4 SiO2 , d) standard lubricants and other standard processing aids.

Description

DETAILED DESCRIPTION OF THE INVENTION Kokumei relates to stabilized thermoplastic molding compositions based on polyvinyl chloride, still primarily polymers containing vinyl chloride.

For example, when thermoplastic polymers are processed into tubes, bottles, molds, sheets, films, etc. by extrusion molding, molding, blow molding, deep drawing, or calendering, the high temperatures that occur result in the decomposition of sibranutics. This results in undesirable discoloration and deterioration of mechanical properties. For this reason, stabilizers are added to the thermoformed MiJ polymer to prevent such decomposition. For polyvinyl chloride and copolymers containing essentially vinyl chloride, it is used as a heat stabilizer;! 1ili iso and organic lead salts, organic antimony compounds, organic tin compounds and cadmium/
Hinifelt is used for barium carboxylate. The above metal compounds are generally referred to as primary stabilizers. To improve its activity, secondary or co-stabilizers are usually added. Other specific examples of heat stabilizers for use with vinyl chloride polymers are found in related references, such as Encyclope.
dia of PolymerScience and
Technology Volume 12 C: j--York,
London, Sitney, Toronto, 1970) 737-7
It is written on page 68.

The above-mentioned stabilizers exhibit a sufficiently satisfactory activity in practice. However, lead, antimony, and cadmium compounds pose certain risks, particularly toxic risks.

Certain organotin compounds are not inherently dangerous, but are expensive and have not been widely used.

For these reasons, there has been a demand for substances that can be used in place of these compounds, are less dangerous, and are advantageous in price. In this connection, metallic calcium, barium, as the main stabilizer
Zinc and aluminum fatty acid salts, aromatic carboxylates and phenolates can be used, optionally accompanied by co-stabilizers such as organophosphites,
Imino compounds, epoxy compounds, polyhydric alcohols or 1,3-diketones are additionally added. However, this new stabilizer system has more or less the disadvantage that it gives the composition to be stabilized only a little initial stability and/or a little long-term stability. There is therefore a need for substances to improve the initial and/or long-term activity of stabilizer systems of this type.

It has been found that dialkyl esters and alkylimides of mercaptosuccinic acid and 2,3-dimercaptosuccinic acid are advantageously used for stabilizing polyvinyl chloride molding compositions. And metallic calcium, barium! 1
The stabilizing activity of primary stabilizers based on lead and aluminum soaps, aromatic carboxylates and phenolates is unexpectedly enhanced by mercapto compounds, especially for the initial stabilization of polyvinyl chloride compositions. The positive effects of mercapto compounds on the treatment of cancer patients have been shown to be significant.

That is, the gist of the present invention is, or [wherein Xl and
! -Represents one group. R1, R2 and R3 each represent a straight chain or branched alkyl group having 5 to 22 carbon atoms.

] A stabilized polyvinyl chloride molding composition comprising at least one compound represented by the following.

A particular aspect of the invention is that (1) a primary stabilizer selected from the group consisting of metal soaps, aromatic metal carboxylates and metal phenolates, together with conventional lubricants and other conventional processing aids; The invention consists in a stabilized molding composition comprising a stabilizer combination consisting of compounds (I) and (n) as co-stabilizers.

Another aspect of the invention is that the compounds (I) and (II) as main stabilizers and co-stabilizers selected from the group consisting of metal soaps, 'A aromatic metal carboxylates and metal phenolates, optionally conventional Lubricant and other 1l
The invention consists in a stabilizer combination for polyvinyl chloride molding compositions comprising conventional processing aids.

In a preferred embodiment, the polyvinyl chloride composition or stabilizer combination comprises a compound (1) in which R1, R2 and 3 are straight chain alkyl groups having from 6 to 18 carbon atoms.

Compounds (I) and (11) are known and can be prepared by conventional methods of organic synthesis.

Mercaptosuccinic acid defined by formula (D) and 2.3
- The dialkyl ester of dimercaptosuccinic acid is preferably prepared by converting mercaptosuccinic acid with a linear or branched alcohol having 5 to 22 carbon atoms, optionally by converting a carboxylic acid into a conventional alcohol with an alcohol in the presence of an esterification catalyst. It is produced by esterification according to the esterification method (
For example, 1louben-Weyl: Mcthode
n der organischenCb cm i
c, 4th edition, Vol. 8, pp. 516-528 (Stuttgart) 1952). Suitable preparation methods are described in the Examples below.

Alcohols suitable for the preparation of compound (I) are, for example, n
- pentanol, n-hegizanol, n-octatool, n-decanol, n-undecanol, n-dodecanol, n-tetradecanol, n-hegisatecanol,
These include n-octadecanol, h-eicosanol, n-docosanol, 2-ethylhexanol, 2-hexyldecanol, and 2-octyldecanol.

Mercaptosuccinic acid defined by formula (ff) and 2.
N-alkylimide of 3-dimercaptosuccinic acid is, for example, mercapto-substituted succinic acid, its F, 7/L
'Made is obtained by reacting an acid anhydride with the corresponding alkylamine.

In this regard, for each condition, e.g.
1ouben-Weyl:Methoden der
Organischen Cll Cmi e,
4th edition, volume 11/2, pages 4-9 and pages 20-25 (
Stuttgart) 1958, and Methodic
um C1iimC11i% Volume 6 pp. 681-682 (
Stuttgart) 1975. A suitable method for preparing mercapto-1-converted succinimide (II) is described in the Examples below.

Alkylamines suitable for the W-formation of compounds include n-pentylamine, n-hexylamine, n-octylamine, n-decylamine, n-dodecylamine, n-tetradecylamine, n-hexadecylamine, Aluminum such as n-octadecylamine, n-eicosylamine, n-tocodylamine, 2-ethylhexylamine, 2-hexyldecylamine, 2-octyltedylamine, etc.

In the present invention, metal soap means fatty acid salts of calcium, barium, zinc and aluminum. These metal soaps are preferably derived from fatty acids having 8 to 36 carbon atoms. The fatty acid components are caprylic, capric, lauric, myristic, palmitic, stearic and behenic acid.

This oil, branched fatty acids, such as 2-ethylhexanoic acid,
2-hexyldecanoic acid, 2-octyldodecanoic acid, 2-
Dodecylhexadecanoic acid, 2-tetradecyl octadecanoic acid and 2-hexatecyl eicozanic acid, and hydroxy fatty acids such as 9. (10)-Hydroxystearic acid as well as 9,10-dihydroxystearic acid are of interest. In the present invention, not only salts of individual fatty acids but also salts of fatty acid mixtures are used. Such fatty acid mixtures are obtained from natural fats and oils.

Of particular interest as aromatic metal carboxylic acids are the calcium, barium, zinc and aluminum salts of benzoic acid and substituted, especially alkyl-substituted benzoic acids.

Examples of metal phenolates include calcium, barium, zinc and aluminum phenolates, alkyl phenolates and naphthinates. So-called overbased phenolates and also naphthinates are preferably used.

Stabilized polyvinyl chloride compositions generally contain from 0.02 to 5 parts by weight of compounds (I) and (II) per 100 parts by weight of polymer. Metal soaps, aromatic metal carboxylates and metal phenolates are polymer 1
00 i-(Used at a rate of 0.05 to 5 weight F1% per placing part.

1. of the present invention. In certain embodiments, the polyvinyl chloride composition comprises polymer 1. Oi to 3 parts by weight of calcium soap and/or 0.1 parts by weight of barium soap per part by weight of O0
~3 parts by weight and/or 0.1 to 3 parts by weight of zinc soap (preferably the soap is derived from C8-22 fatty acids), the total amount of metal soap being 100 parts by weight of the polymer.
Parts by weight, usually 3 parts by weight.

Polyvinyl chloride compositions often contain polymer 100
Compositional formula in hot water form per part by weight = 0, 7~l, l
Advantageously, it contains 0.2 to 5 parts of finely powdered crystalline synthetic sodium alumosilicate having 1.3 to 2.45 iO2 of Na20-Al2O2 and containing 13 to 25% by weight of bound water. be.

Sodium alumosilicate as defined in
NaA type zeolite is preferred. It has an average effective pore size of 4A and is therefore also called zeolite 48. It is known to use this zeolite as an auxiliary agent during the processing of thermoplastics (see, for example, US Pat. No. 4,000.100- and European Patent Application No. 0027588).

In a preferred embodiment of the invention, synthetic zeolites of the above type are used in which at least a portion of the sodium ions present have been exchanged with calcium ions. In this case, up to about 75 mol% of the originally present IJium ions can be exchanged with calcium ions. This composite sodium/calcium alumosilicate is prepared by heating type 4A sodium alumosilicate with calcium chloride solution several times. It can be easily prepared by processing, preferably at high temperature, to produce bamboo. The composite sodium/calcium alumosilicate is preferably used in gamma kneading with sodium alumosilicate NaA.

In addition to the above additives, the polyvinyl chloride composition of the present invention contains a polyol having 2 to 6 carbon atoms having 2 to 6 hydroxy groups and a fatty acid having 8 to 22 carbon atoms as a lubricant having a stabilizing effect. You can get I'1 part Eldel from . This partial ester has an average of at least 1 ester per molecule.
Two free polyols have hydroxyl groups and are prepared by esterifying the corresponding polyols with 117J acid, optionally in the presence of a conventional esterification catalyst. be done. The polyol and fatty acid are reacted in a molar ratio of 1:] to 1:(11-1), where n is the number of hydroxy groups in the polyol. Preferably, each component is a partial ester OH
Use it so that the value is 140-580, especially 170-540.

The reaction product may be an ester mixture, but 1
An acid value of 5 or less, preferably 8 or less].

Suitable polyol components include ethylene glycol, propylene glycol-1,2, -propylene glycol-1
, 3, butylene glycol-1,2, butylene glycol-1,4, hexanediol-1,6, neopentyl glycol, trimethylolethane, erythrite, mannitol, sorbitol and especially glycerin, trimethylolpropane, ditri Methylolpropane, pentaerythritol and dipentaerythritol. Examples of suitable fatty acid inhibitors are caprylic, capric, lauric, myrimethine, palmitic, stearic and hihehenic acids. It is also possible to use substituted fatty acids, especially human coglylated acids (such as '12-hydroxystearic acid), in addition to synthetic fatty acids or unsaturated fatty acids (such as oleic acid and lylunic acid) having 1 carbon number. In most cases, a mixture of fatty acids, such as natural fat U5
Or use one obtained from oil.

The polyvinyl chloride compositions of the present invention generally include polymer 10
0 parts by weight of Cyporio p-part entel in an amount of 0.2 to 2.0 parts by weight.

Additionally, the polyvinyl chloride compositions of the present invention may contain other auxiliary and processing aids, such as paraffin with a freezing point of 45-90"C and/or low molecular weight polyethylene with a softening point of still below 140"C. Advantageously, these waxy substances are used in combination with free fatty acids, preferably fatty acids having from 12 to 22 carbon atoms, such as those obtained from natural fats and oils. Particularly advantageous effects are achieved by palmitic and nutearic acid (11).Commercially available fatty alcohols having 12 to 22 carbon atoms may also be included in the thermoplastic compositions of the invention.

Further additives include bombers based on certain polymers, such as methyl meccrylate, methyl methacrylate/butyl acrylate, ethyl acrylate, methyl meccrylate/acrylic acid and butyl methacrylate/nuthylene. These polymers are known as glidants. The butyl acrylate polymer acts as a j'ill' type agent during processing of polyvinyl chloride compositions.

In some cases, it is preferred that the polyvinyl chloride compositions of the present invention include an antioxidant. In this case, diphenylolpropane, 2,5-bis-(l,1-dimethylpropyl)
Hydroquinone, 2,6-tert-butyl-4-methylphenol, octadecyl-(3,5-tert-butyl-4-methylphenol)
Preference is given to tert-butyl-4-hydroxyphenyl/I/)propionate, 1,1.3-)lis(5-tert-phthyl-4-hydroxy-2-methylphenyl)butane or dilaurylthiodipropionate.

Polyvinyl chloride compositions for producing hollow articles or films or sheets contain 0
．． 3 to 5 parts by weight of epoxidized soybean, oil and 0.1 to 5 parts by weight
It may contain 0.8 parts by weight of high molecular weight ester wax. High molecular weight ester waxes include montan wax, paraffin oxytate and complex esters.

The base components of the stabilized thermoplastic composition of the present invention are:
Consisting of vinyl chloride homopolymers and copolymers. The copolymer contains at least 50 mol %, preferably at least 80 mol %
Contains mole % vinyl chloride.

The polymers can be produced by any method, such as suspension polymerization, emulsion polymerization or block polymerization. The value of the polymer may be about 35-80. The scope of the invention also includes compositions based on chlorinated polyvinyl chloride, as well as compositions based on resin mixtures based on ji4 autopolymers or copolymers of vinyl chloride. Furthermore, in the present invention, the concept of polyvinyl chloride compositions includes not only certain moldable semi-finished products, but also articles optionally molded from these materials.

The components of the polyvinyl chloride composition of the present invention are mixed using a conventional mixer. In this case, different components of the stabilizer combination? It is also possible to mix first and then mix this mixture with the polyvinyl chloride-based 4d material.

The stabilizer combination of the invention for polyvinyl chloride compositions comprises, in the simplest case, a main stabilizer selected from the group consisting of metal soaps, aromatic metal carboxylates and metal phenolates, and compounds (I) and ( ■Contains 1).

In a special embodiment of the invention, for each part of compound CI) and box 1-11: 0.5 to 10 parts by weight of calcium soap and/or 0.5 to 10 parts by weight of barium soap and/or 0 These soaps are provided with a stabilizer combination containing .5 to 10 parts by weight of zinc soaps, which are soaps derived from fatty acids of order 8 to 22. All of the above 1~
The total amount of soap does not exceed 20 parts by weight per 1 part by weight of compounds (I+ and (Ii)).

As the basic component of the stabilizer combination of the present invention, the above-mentioned sodium alumosilicate is important, and the compound (
I) and ('') are used in amounts of 90.2 to 20 parts by weight per part by weight.

Preferably, the stabilizer combination comprises at least one lubricant selected from the group of partial esters from fatty acid topolyols defined above. In this case, the )111 minute ester is used in an amount of 0.2 to 5 parts by weight of the compound (monthly and (■)).

The stabilizer combinations of the present invention may optionally include ponding aids and processing aids for polyvinyl chloride compositions.

The stabilizer combination can be prepared by simply mixing the components mechanically using a conventional mixer. Depending on the preparation, the combination is generally obtained as a flowable, non-splatterable product.

Next, manufacturing examples and examples will be shown to specifically explain the present invention.

Preparation Example Preparation of mercaptosuccinic acid dialkyl ester 500 g of mercaptosuccinic acid (C5.3 mol) and sodium hydrogen hydroxide hydrate], 5 f of n-decano/L/
1043g (6.6mol)) suspension at 70°C with stirring.
and kept at that temperature for 50 minutes. The generated water is
It was removed using a weak vacuum (approximately 4 Q mbar) apparatus. The internal temperature was then increased to 80° C. over 1 hour and the mixture was further stirred until water evolution had ceased (approximately 2 hours). The resulting product was cooled to room temperature and filtered through diatom ±3'OI. Transfer the filtrate to an oil pump vacuum (approximately Q, 4 mba
r) for about 2 hours at 80°C to remove the remaining volatile components, cooled, and filtered through ±30 g of diatom while still cooling to obtain mercaptosuccinic acid di-n-decyl ester 133.
4.9 (yield 44%) was obtained. 11 ”', ;= 1
．． 4.61.0゜Mercaptosuccinic acid n-hexyl ester and mercaptosuccinic acid n-octadecyl ester/"e printing using n-hexanol and n-octadecanol in place of 11-decanol. 2,3 2,3-dimercaptoco/N-phosphoric acid di-n-hexyl ester was obtained from -dimercaptosuccinic acid and n-hexanol in the same manner.

Production of mercaptosuccinic acid alkylimide 40 g (0°264 mm) of mercaptosuccinic acid was added in a three-meter flask prepared with stirring, a reflux condenser, and a water separator (Iifi).
), n-decylamine 41.5 F! (0,264
m) V) and mesitylene 200- were treated with a nurphonic acid group-containing ion exchange resin (Levat it (registered trademark)).
S I Q O; Bayer AG (Lever,
The mixture was heated to reflux while stirring in the presence of 5 g of the reaction water (about 9 ml) expected in the imide formation until the amount of reaction water expected in the imide formation was removed. From the cooled reaction mixture, remove
The plot was destroyed. The solvent was distilled off from the p-liquid to obtain N-n-decylmercaptonuccinimide 68.49 as a transparent viscous liquid.

In Examples 1 to 3, the effect of the stabilizer combination was evaluated on the static thermal stability of the Tsukinobu sheet.
crmostabilit'it). For this purpose, a polyvinyl chloride composition containing a stabilizer mixture is
Experimental rolling mill (S) with dimensions 350 x 150 mm.
chwabenthaniJ41iu) at a rolling temperature of 170°C and a rotation speed of 3Qrpm. A sample sheet was obtained by processing the sheet for 5 minutes.A sheet with a thickness of about 0.5 mm was placed on a square test piece with a side of IQ 7717Ij.
7I was cut, and this was installed on a drying rack with 6 rotating hurdles (]
(eracus FT42 OR) at 180°C. After 10 minutes, the test piece was taken out and its color change observed.

Tables 1 and 2 below show the test time at which the initial coloring of the sample piece was observed, and the subsequent strong color change, corresponding to the composition of each polyvinyl chloride composition. 3 (stability deterioration) or the time required to complete the test. If the value O is indicated for the initial coloration, it means that coloration has already occurred during the production of the rolled sheet.

Example) Cloudy polymerized PVC (I value 70; Vestolit
S 7054 (trademark); Chemiscbe W
crke ll1ils A G (with Marl) 10
0 parts by weight, 0.2 parts by weight of stearic acid, 0.2 parts by weight of paraffin (melting point 71°C), pentaerythritol stearate (molar ratio 1.5:1, 0I-I
Value 212) 0.5 parts by weight and calcium stearate 1.
A thermoplastic composition A (comparative composition) was obtained by mechanical mixing with stabilizer combination A' consisting of 0 parts by weight and 0.5 parts by weight of zinc stearate. To prepare polyvinyl chloride compositions B, F of the present invention, the following additives were added to stabilizer combination N to obtain combinations 13'-F': B': 2,3-dimercaptocono\ 0.5 parts by weight of phosphoric acid di-n-hexyl ester C': Mercaptosuccinic acid di-n-decyl ester 0.
5 Part by weight D': Mercaptoconohydric acid di-n-octadecyl diester 0.5 part by weight E': N-n-decyl mercaptonuccinimide 0
．． 5 parts by weight F': Merno J butosuccinic acid di-n-decyl ether 0
．． 5 parts by weight + 1.0 parts by weight of branched sodium alumosilicate In stabilizer combination F', molar ratio of Na, 20:A1203:5j02 = 0.9: 1: 2.04, water content 19 tons, f, i, % fine powder crystalline synthetic theolite) Na
A was used as sodium alumosilicate.

The compositions of the stabilized polyvinyl chloride compositions A-F thus obtained are shown in Table 1 below.

Thermal stability of compositions A and F was tested according to method 1. The results obtained are shown at the bottom of Table 1.

'Enter 1ri Il! /ll 2 :11 Ijl'l:J 'T1go P V C (Kfll
:1', 7 Q; Vcstolit S 705
4 (quotient 1 vote); Chcmi 5c11e Werk
e trirl s A G (in Marl)) 100
3 parts by weight, 0.21 parts by weight of stearic acid, 0.2 parts by weight of paraffin (sub I point 7), 0.2 parts by weight of stearic acid, 1 part by weight of stearic acid, 1 part by weight of stearic acid (molar ratio 1.5:
1; 0I-1 (+¥1.2]2) 0.5 parts by weight and stearic acid] D! 0.5 parts by weight of lead was added to polyvinyl chloride compositions G and L by means of a stabilizer additive. 1.0 parts by weight of G calcium nystearate 11 parts by weight of calcium nystearate 1.0 parts by weight of mercaptosuccinic acid di-n-decyl ester Q, 5 parts by weight, per 100 parts of polymer, respectively.

I: 2.0 parts by weight of sodium alumosilicate J: 2.0 parts by weight of sodium alumosilicate 0.5 parts by weight of mercaptosuccinic acid di-n-tertyl ester: Na/Ca-zeolite ■: Sodium alumosilicate 1.0 City to 1 part Na
/Ca-zeolite 2.01;
Molar ratio of 3:5i02=0.9:1:2.0
4. Fine crystalline synthetic theolite Na having a water content of 19% was used as sodium alumosilicate.

The Na/Ca-zeolite used in composition
29.0%, S i0234.1%, )12029.8
% (each city ↓ 11%). This converts the thorium ion of zeolite NaA to 8.0'
It was converted into calcium ions by equilibrating several meters with a 15 to 7.5% by weight calcium chloride solution in C.

The compositions of the stabilized polyvinyl chloride compositions G and L thus obtained are shown in Table 2. PVC 71/
Jill acids G, I and 1 (are ratio 1 bite compositions).

The thermal stability of compositions G and L was tested according to the method described in 2. The results are shown at the bottom of Table 2.

Example: Stabilizer combination M with the following composition was prepared by mechanically mixing each component.
2 parts by weight of zinc nistearate 6M4 parts of barium stearate
70, Vinnol (trademark) H7Q F, W
Made by AckerChemie (Munich)) 100
Parts by weight, di-2-ethylhexyl phthalate 50 f
part fi, 2 parts by weight of epoxidized soybean oil, combination M'0
．． 9 parts by weight were mixed. When the resulting composition was tested by the method described above, stability deterioration occurred after 50 minutes.

Comparative experiment: When mercaptosuccinic acid di-n-decyl enether was omitted in combination M, stability was lost in 40 minutes in a similar test.

% +fF Out MF f3 Henkel Commandit Geselschaf! ...Auf Akchen

Claims (1)

[Claims] 1 test: Xl-Cl-l-C00R1 1(1) One is S
Represents I-1 group. ml, R2 and ken each represent a straight chain or branched alkyl)v group having 5 to 22 carbon atoms. ] A stabilized polyvinyl chloride molding composition comprising at least one compound represented by the following. 2. Common moisturizers, IT agents, common processing aids, and (2) a primary stabilizer selected from the group consisting of (1) metal soaps, aromatic metal carboxylates, and gold + rsX phenolates. 2. A polyvinyl chloride molding composition according to claim 1, comprising a stabilizer combination consisting of a stabilizer and using the above compounds (I) and (II) as co-stabilizers. 3. The polyvinyl chloride molding composition according to 1) Ji or 2, which contains 0.02 to 5 parts by weight of compounds (I) and (IT) per 100 M parts of polymer. 4. The polyvinyl chloride molding composition according to any one of Items 1 to 3, wherein R1, R2 and Rin in formulas (■) and (II) are linear alkyl groups having 6 to 18 carbon atoms. 5. 100 parts by weight of polymer, 0.0 parts by weight of calcium soap.
1 to 3 parts by weight and/or 0.1 to 3 parts by weight of barium soap
The polyvinyl chloride according to any one of items 1 to 4, wherein the weight part and/or weight of the zinc soap is 0.1 to 3 parts by weight, and the soap is derived from a fatty acid having 8 to 22 carbon atoms. Molding composition. 6. Per 100 parts by weight of polymer, compositional formula as anhydrous form: % Formula % contains 0.2 to 5 small parts of HfF of finely powdered crystalline synthetic sodium alumosilicate containing 13 to 25 weight percent of bound water. The polyvinyl chloride molding composition according to any one of items 1 to 5. 7. The polyvinyl chloride molding composition according to item 6, wherein some of the sodium ions in the sodium alumosilicate are exchanged with calcium ions. 8. Comprising a main stabilizer selected from the group consisting of Jinku soap, aromatic metal carboxylates and metal phenolates, co-stabilizers and optionally conventional lubricants and other conventional processing aids, co-stabilizing. As an agent [in the formula, Xl and X2 independently each represent hydrogen or a S H group, at least one of which is 5I
Represents IJiQ. kl, 1e and R3 each represent a straight chain or branched alkyl group having 5 to 22 carbon atoms. ] A stabilizer combination for a polyvinyl chloride molding composition, comprising at least one compound represented by the following. 9. The stabilizer combination according to item 8, which is a linear alkyl group of the formula (■) Oyohi (J■) no R1, le Oyohi R3) f <X'l1i6-18. 10. Power per 1 part by weight of compounds (I) and (■)! Contains 0.5 to 10 parts by weight of racium soap and/or 0.5 to 10 parts by weight of barium soap and/or 0.5 to 10 parts by weight of zinc soap, the soap being derived from fatty acids having 8 to 22 carbon atoms. The stabilizer combination according to item 8 or 9, wherein the foil is 11. 0.2 to 20 parts by weight of finely powdered crystalline synthetic sodium alumosilicate containing 13 to 25 weight % of bound water, loaded with composition formula as anhydrous form: % formula % per 1 part by weight of pyrazolinone (■) 12. The stabilizer combination according to any of clauses 8-11. 12. Part of the sodium ions in sodium alumosilicate has been replaced with calcium ions, 11
Stabilizer combinations as described in section.